不锈钢酸洗污泥对烧结黏结相与平衡相的影响

 不锈钢酸洗污泥安全填埋占用土地且难以消除对环境的危害，将酸洗污泥作为烧结配料使用有望回收其中铁、铬、镍等金属，并充分利用其中的熔剂组分，实现酸洗污泥在冶金企业的闭路资源化利用。铁矿粉配加酸洗污泥烧结黏结相强度试验表明，随着酸洗污泥配加比例的增加，黏结相强度先增加后减小，且随着碱度的增加整体减小，当酸洗污泥配加比例为10%时，试样中赤铁矿、磁铁矿质量分数最大，枪晶石质量分数较小，在碱度为1.5时于1 280 ℃焙烧4 min，试样的黏结相强度最大可达15.12 kN。平衡相烧结试验表明，配加酸洗污泥能改善烧结矿质量，铁矿粉配加10%的酸洗污泥，碱度为1.5，1 300 ℃烧结240 min后，烧结矿的矿相组成和微观结构最好，综合性能最佳。

Effect of stainless steel pickling sludge on bond #br# phase and equilibrium phase of sinter

The most commonly used safety landfill disposal method of the stainless steel pickling sludge occupies land and cannot reuse the valuable components such as nickel and chromium that exist in the pickling sludge. A technical idea of using stainless steel pickling sludge as sintering burdens so as to recycle valuable metals of Fe, Cr, Ni and make full use of the flux components was proposed, expecting to realize the closed circuit resource utilization of pickling sludge in metallurgical enterprises. The bond phase strength test of iron concentrate added with pickling sludge showed that the bond phase strength increased first and then decreased with the increase of pickling sludge, and the corresponding value decreased with the increase of basicity. When the iron concentrate was added with 10% pickling sludge with the basicity of 1.5 and heating at 1 280 ℃ for 4 min, the content of hematite and magnetite in the sample was the largest while the cuspidine content was the smallest, leading the bond phase strength to reach the largest(15.12 kN). The equilibrium phase sintering test showed that the addition of pickling sludge could improve the sinter quality, and the comprehensive performance of the sinter was the best when the iron concentrate was added with 10% pickling sludge with basicity of 1.5 sintering at 1 300 ℃ for 240 min.